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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8e2b891da8b621482f3c2e2a120b87fd26cd4ffbfd9fe4a006a3ca044114d8' 
  AND token = '+qyAcellRr+keczFatzgzpP+6DYmV3Kau5m6Ha88vWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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