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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '511ef93e9c907d03d3f4d06de3cd8f99e6593e746d8db7dcd46d224fffe7551f' 
  AND token = 'SaH2SCXB8Cy1jjyrIEG+s2TAhaUMwI4zaNZn8tZ1sp4=' 
  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"
    }
  }
}