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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9d29615752ae9d47430fe869319942a3808be55f5d282938267de3719e627b' 
  AND token = '3vZJGj+gEkaKsQON0cO76YszpDeHQX6hEIpN82LNXJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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