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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0f56ac872757ebd6eef6b79068ecca894eadd604cdca32182be87605ebec030f' 
  AND token = 'ATtCnWPunQLTBCbpsRdHUBMBQ8CljwLwID6RFllv0QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00989

JSON explain

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