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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e7d5c9d0cbea3403d3778297eb31c2de2a2f5cb010fb8a68c88e3f46c17ec7fe' 
  AND token = 'X1Q2VqDVNFLaqS/xnt0p6SS3VpGNgiRHz7PNimE5ya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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