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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd48ab4c81229a51a1253a16861f7008278c7d3e4eed85e795ef63ce1059da4af' 
  AND token = 'TICt1PAIDFN8H2OCOXtjciLWeb2ovArZsK/ekOcVXSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00872

JSON explain

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