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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d277645e132c4cde37c3fce89c434deeadcb20fe2cb5674d0f3568f2590265' 
  AND token = 'MzXQQ8wORGjqE8KIUENu6rEjV6V8N9/86p2kD5Kf1lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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