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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a2c7f98ba367579c578b6c0f0d8486a27c46fae996d00fa86bef21661a8caa' 
  AND token = 'jb7EympyIDLI4k6oa2qGUaaaQx2GF/Neh8vCWk6vrBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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