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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '34256a62c5539a01cff2526d5f6d7765c36f6fac99d18fa864c17e3ed3863edd' 
  AND token = 'C12E4NWa1MLVDKZu/lu+073x61CuyOaZZF1AaZADxmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00856

JSON explain

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