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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf787cea659d770d8cc82204a472587c3a43e964a5e75b19d98a3553c217ed7f' 
  AND token = 'jiildEKsJtnpWlLXCay76vOROKtj4JzEX27P329oSJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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