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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aad74c0118c01ee7519c5d15f6345cce3efa212769b21b3c1e4096edc5418ce' 
  AND token = 'TryEBcIem3BUUJvWY5fwTlCNxuvM0N3BBR+beByDPrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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