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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50f6929920d392660bd93b1353f200f96a31396110990d542416522f4b21709' 
  AND token = 'fLnmkQwsNB3v/QTaMqotDb2stb1TAAliknva0+E8xQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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