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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a396bd4e783d9b3cdbab6b5d72fcbf85df17a4ad8103aaf7729d9036e6ea874a' 
  AND token = 'F/eXs0j98LmHe1MgTCLrrHSwftANtSTx7zcPKidHxnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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