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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a5c3836b4e9804d08951757140b03f6cdfec88f3b05139b59d985b8c53ed3e11' 
  AND token = 'cMm8neM7TxauLxy2umow/qMjl3mxNWvP5J+qwAFmHds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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