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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dbe6abb0f9b5acf37e23f6aa1b64b7c37909758e3982c62788292fb1d7c001' 
  AND token = '+wt2Nu8Ur623EnqQavrVvtJTTYI+58KUcGDNFPyW7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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