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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3ff905b82a14cf9ed0dd3c5ab0be055039db838d5ada0f0f2b4eaa6aeebb0f79' 
  AND token = 'RFSu3NZ924Jezu1Na2F6ltVOApAJAldaUCBRdlsON10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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