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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e453d4e34a365c974e1f24fdec92ef716c24fd8b71ae708f54dc49fcc18b685a' 
  AND token = 'cKAn0Z8jprHe3zcodI20H5s119qhsB/sVFH0piybRYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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