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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494f190196ecbb239113815b3c3954ba0093cabf3b247d507b070842abc9979f' 
  AND token = 'N0TmSlNPxaplY4MsOGYFL/LM6UkSRkLU36E036E4B+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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