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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0040912e83c9d449720337058c738ffc4d317794858d2a115fc2d0c7c75215' 
  AND token = 'K1rH/Ll2u2xpBMj1+IWFqUqlk2oCkJ02OjK4jVkMDFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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