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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd14d3cb8ce85121681c7a359edfb788f2f3a177716d9218af26579129facf63e' 
  AND token = 'BIy4OzV4YGthktiMxacJZOI9eWacrCHEk7spsjEXCNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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