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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a64a3070cf7c36861e7e0a1c8133311c0bec6c0a73e0ebdd39287f764af8c71' 
  AND token = 'qlF+fZEVlOIun1JG77S1xlg7PTuir3gnsHiRMlE4d48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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