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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101188f6485ca9459fd211bd047bd3ae93431efa379fe598559d912aca4846cc' 
  AND token = 'bgMxc9cyQp2y0shk5nEq5kifU9wdm7dRK7doeQgnfdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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