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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9028a34eec8aeb6dd6b10b532a66a5a8f7f4c8d566096954b196ec96f350fceb' 
  AND token = 'kH5+Q2UTateu/Iu4qwNzhIazdvssvFcXxkNiTnAzTyA=' 
  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"
    }
  }
}