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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1261d3926ed7844f326f55eae529425fe61230e9b6f140ed7e40fb0aaf315574' 
  AND token = 's0VfUm5lXk2yzoZrOGBsjHozq9zJxRs8V+SAcc9ubFA=' 
  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"
    }
  }
}