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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dcf7ee49c7b1a9c4d839db15389c006956cdd35849118b664955678c27fb31' 
  AND token = '1B4C6E+pCBTOilRwZgTXivRSodbSC9ALCAZD1q///yg=' 
  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"
    }
  }
}