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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293af539980b9b853def404f992e8efd1355b34d2079f54b67ab5367084db31e' 
  AND token = 'A/Z8HDZ0VyQfpH/damR8X4xdQh3vFXFC2hQiVbIrVFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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