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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b9f94ae6e7b82658a20c72a6e534a13039e630b9d4d788515eebbf66d19f9d' 
  AND token = 'Db+SBEzpaL5LEPG1jDDwkAz6ekMmDG5bKSlg8mcAFSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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