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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36187df08a6139b767c309083e964c6ca2158eaa879a4b1232778e57a30806cb' 
  AND token = 'HmYIpyfvoeEKtoYrRVHT4sIPh79y9Iqri5LLTfrlY+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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