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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e3a20c601ae3371b0f2c6bcadd2a88327de847abe5969ab11d3180cdbebc0679' 
  AND token = '+W2vn1KHlcS5/jy4r5/dE+FnKNVSfpnrrFGffsspiaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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