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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6cc8567d8f27856297056e89bd1d7e8509aae1e3f099e4f11095c49d207b24' 
  AND token = 'xFPE8Qca4Ee0FqNSY8sshOQ4BWNVpjQW63fdP62Nrj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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