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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5c8d495e1dfb825efd5e45fa9381a9a78af2eb51c38025bd85ea4332080c9318' 
  AND token = 'NgNNe8fgvOfsPWbwoS3eH+qwuucXuGJ2DJ2UbRDNVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00864

JSON explain

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