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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbd1815bf97e273789ea3110b3017fe399dce8ab580b85927d5520825b06d4f' 
  AND token = '/S6mUU6+kJKBY05cgMK48ffrm30GvoKNZr2bC2zcA8Q=' 
  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"
    }
  }
}