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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4f320edb4a955220566d03e1c1864a03221843fd2693a336dc49417d800d9841' 
  AND token = '3Qfly9hZ8SnHEc3PEGXCAsD+W4qc8e8fxjIsMbmQRgM=' 
  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"
    }
  }
}