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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9f8d02bb8862527894567bb57534865e777a9226c8941adc389308d4e040efb9' 
  AND token = 'qBqphhV0qJOG044JVWaQ8TOat0TaeW26RVsEsT+4tCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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