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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c48f9a3b65aad5e24bee79eb9f45ccf71597685a775100b781ad3317929e1f' 
  AND token = 'akG1Y39+y65jLbNhAuavVI7RlhonnzsZvXdPPefwlho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}