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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '12368746448ac725dce2f9db8a876a1468d99e96edb89ff8c734c5248721f803' 
  AND token = 'bRvwrqkGaRtFajOUwVEQJ2Qfy+Rb21pCPTnDn9MN318=' 
  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"
    }
  }
}