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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e2349dd65592af77bce39f05231cea512e738c57ea74059cc25d38ca4b2b42' 
  AND token = 'Z0NgZY7n8TNinO2cTPIemUXDg6dzGc5gJ220EmMl+AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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