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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ab4f25b659d28ccfe183eb02b4d703cd05f83fe5abbefea484ac58ad9103a269' 
  AND token = 'ZcdxQ8nKg+i3T9VmM7+lnVpZk/8DCYy+81Nl3teAY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00855

JSON explain

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