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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7cdea8d6862090dd5173b7f0b9f69943ba827c7c409b6be31c3fd7ea1ce434f2' 
  AND token = '9QuUAXz4388kVMPzmQDCqV0wQbi0ul+2U6PwkkWTUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00775

JSON explain

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