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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500010ae3714f961aeeff0e6005b9ef1227a60e6745a5533ee422f00a232609b' 
  AND token = '1dtBY1crZ8w/s2zVn4I9r7LOlAq0OYkPmr8hsE8Hovs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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