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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9e82669e1c8ac5babfc288f0308ed7c2600d158d1ed1ddcec460eaabfa3f28' 
  AND token = '27KXVKa6fCiIxbsfE/MJ7sE21Dxswgn+uFBRoMlcV1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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