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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5da8dccb6cff3abd3cd9238f7a1c63d1ab3523396e72d772e4d3ee0e919c0ce2' 
  AND token = 'Cfh0+2W0jOApjZcz17BB0k32y1kq78dl7Vd4mkzaS74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00881

JSON explain

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