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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2b2574cfdc6464dbffc107db135c6a9dedfdabda0d54fc5a3dae66a6d4011205' 
  AND token = 'zqqFTCumnPle0LFKvFduRJm54oEwMilKjy+j1Q1fgAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00803

JSON explain

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