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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '15d919fa14827276bb968faed90e3366ffaba17f750a2cf645d5c8126072b2ee' 
  AND token = 'pe8DjJdOLCGeyegjZGe10IZfxGjmpdczFklu5D4bxRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00774

JSON explain

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