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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fc36d33bc29d5e66dd9b11e18307c2ed1598c1c2d1b9f7670eb17df9c9aca1' 
  AND token = '8YkNNYnuM+p8O2TNEJdTDYosU3gwAc8dm0+1R4CVJKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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