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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1303ef21fb9cbc1447ca720a4beb0b4e804fb4c6f32881b4c1f6f238ff2db506' 
  AND token = 'JwselOfDPpIhnjIIlyhxHz2nl43D1eFhX+oUnwD02ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00844

JSON explain

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