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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7e3be12137703c3832db92d6e97301787d1d58acc4094d3ffdb8b29fa596973d' 
  AND token = 'FA6tJjLQ3cNFQ1fsNzz4rBtWQYIFf2dBeA1Uv7gkN4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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