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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dca540717ac46749cad24f6dfbcda022ea397b7fb64293fe08c9e7eb5f0267a9' 
  AND token = 'F7kdBRsB23T3kXKDN62EgQT5+8X2nDOBzfevtk8EdSk=' 
  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"
    }
  }
}