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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f81cda9fbad9dd9cc74941fa060bf57475515e42ee4548c8a4ddf170fb13cad' 
  AND token = 'r2ueNMF1g85KWMO0I2fxD3DX0rPMFa1LEQ6vj9GL+VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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