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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cd9327597c27344be87cc22fdcbe392a3bbfb59b91a88937385d33f84dfd3189' 
  AND token = 'IChPAdi0uT1Y6JW5bnxPGlk6il42wYp7oQ8iYAEoqX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01100

JSON explain

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