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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7601556cb835b8d5449eb3446ad510b0a7c03951b8b4dd046a8bfd51f3ba7217' 
  AND token = 'fx6i2+onII/KHgK9NmIDb4G5cPKvgLBkP/7Lof2IoVU=' 
  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"
    }
  }
}