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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a4668cbbab78639abfe61a2ba1bc768d002a767d05703884b64fc4b5b6f295' 
  AND token = '+6+S3rggT4W+Ujz5yN1RfiEUHLT5zbSNaBd66rE5VoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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