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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f7b25a1ecd31ad8e82fc2bf238d491f8ef9388a3a5e64d0858d20efe743534' 
  AND token = 'fuQu5kWQlQcAfLb0E72W5+YZdU5If5czz+CDAfgHs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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