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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cb9d56e5f81fe6581ee5c4d72b45fa5ce5cc5b0355b0224c229def2e650633b0' 
  AND token = 'GMXjRMjZwBv7N8Afucs0RYWVRH1FaWO00qSQdhHs5+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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