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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775aa24b1f2e1be1a3045ad8a8e3160c9c029cae91ab384a0ea35a46bd7acd54' 
  AND token = '90cVZkPdnnyHEoUR6zHSTSypDLFcW8tWIu3f+Z+T/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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