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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a371be0d9be98454bdcbdf9f0037fa6825e72c98da9d326bf657334e3449a4c2' 
  AND token = '8BoTB3jtPw6G+R6SyClhMBiWW4UT+2niChxzk8AhFn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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