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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59e298df60b839b11019d70a89e16a408ee30b587e7e536f6e129e4879b756c' 
  AND token = '3L8SKoJx/jsGbNfpAR8sr+BSIEfAS4i+NydrAHok2q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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