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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527dfdfc70ee4e7db8d89331159232cf57c1ec7242c2cfa8ad7eece0310eef06' 
  AND token = '8SsbWUF1XsAbZ/cC7VcvF7SBz3HQTqcUmAefmWac7oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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