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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda8e5d78e7eb6ffe96af2b62806c26f4e0cb123af5ee09570e64252eb9c81f' 
  AND token = 'aGZi++rjsX7FbSGSHJVmWijpKJBu6tcsDqrp+6koFzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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