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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'acabec1d538a61db941706ef9c7121eaceb5292da7f21b3d7057531a0ab83c03' 
  AND token = 'x7I/lFoicx9KONvm2E3wE91jIysgxvaDU9izZfoaqNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00889

JSON explain

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