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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e462abeb3579e08a1a1d7b13df5c0fae350e47ab092db862f9e22ecdc41b617b' 
  AND token = '7Bsey9dRexVf9JtfxF0Emg3AA9ARj03bqGvPgjYrABg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00805

JSON explain

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