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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d18748b25993302dc9ffa2d26afcee17e5847d00fa57cfa56b32bce62da4075' 
  AND token = 'iqsNSJ4C/I488yeu4xD782k98bILQs5jRa0MhRXghQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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