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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4a4a257d43758c1b6ac27de6919e8bce06746eff158c15a9ad6ff81f812da59d' 
  AND token = 'EXbAGNiolm/6Vi8Pt3R2u3atKefq6hdJ0IZBXo+S0Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00784

JSON explain

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