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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d617219da6cae9d8f89944a7d88cc884b12516b80387eb264ca80d742a1dda' 
  AND token = 'RzC6xHfKuGWlPe0R4zc1Umf3SxCRnb+4WsJTUmBQjZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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