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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e0a0d2111f6bb9ee3dc441fe5a1108e1432dbf37950dc29d549b99b843e39f8d' 
  AND token = '/38242tSlahcZR/afLJmSDc+Z+2nWNH/1dCc6hnnMWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00898

JSON explain

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