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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1705999ab3d3af23735174f45bcbb47d44333ef791c41c45faabca831908582e' 
  AND token = 'm9T1J2gsiFYU2rV/pQmlR1DX9wMj5wU4qNjq2/UksJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00822

JSON explain

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