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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fc765d11e85d83d3feb3af48a2cfa1ec3313ad305ac0a0cc92b2a83142a7380f' 
  AND token = '+ZSAWOoTJfsNa+Wc72r3+pcNYGPq4G0/qjbKv6jJxvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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