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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b90da45a07337a768ab319c85ece26837c32d016ebc9c0ce97957dac827846' 
  AND token = 'OfA6lkL+h+7N2E7+hIFJFTo9xza4LwoArLpyBeTRiOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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