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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5619b91489005321d8b024e0a67858988525ce3949387635d4266fe985a7018b' 
  AND token = '6+g0A/zlhM2TI8rzcFnct6TfIoxB0DbD8i871c18wHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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